[PATCH v2 15/21] serial_lpuart: add clock enable if CONFIG_CLK is defined

[Giulio Benetti]

Hi Lukasz,

On 1/28/20 9:36 AM, Lukasz Majewski wrote:
> Hi Giulio,
> 
>> This driver assumes that lpuart clock is already enabled before
>> probing but using DM only lpuart won't be automatically enabled so add
>> clk_enable() when probing if CONFIG_CLK is defined. If clock is not
>> found, because DM is not used, let's emit a warning and proceed,
>> because serial clock could also be already enabled by non DM code. If
>> clock is found but cna't be enabled then return with error.
> 		     ^^^^ - can't

It's too late now, but...

>>
>> Signed-off-by: Giulio Benetti <giulio.benetti at benettiengineering.com>
>> ---
>> V1->V2:
>> * moved error as warning if clk not found
>> ---
>>   drivers/serial/serial_lpuart.c | 16 ++++++++++++++++
>>   1 file changed, 16 insertions(+)
>>
>> diff --git a/drivers/serial/serial_lpuart.c
>> b/drivers/serial/serial_lpuart.c index 4b0a964d1b..b2ec56172e 100644
>> --- a/drivers/serial/serial_lpuart.c
>> +++ b/drivers/serial/serial_lpuart.c
>> @@ -483,6 +483,22 @@ static int lpuart_serial_pending(struct udevice
>> *dev, bool input)
>>   static int lpuart_serial_probe(struct udevice *dev)
>>   {
>> +#if CONFIG_IS_ENABLED(CLK)
>> +	struct clk per_clk;
>> +	int ret;
>> +
>> +	ret = clk_get_by_name(dev, "per", &per_clk);
>> +	if (!ret) {
>> +		ret = clk_enable(&per_clk);
>> +		if (ret) {
>> +			dev_err(dev, "Failed to get per clk: %d\n",
>> ret);
>> +			return ret;
>> +		}
>> +	} else {
>> +		dev_warn(dev, "Failed to get per clk: %d\n",  ret);
> 		^^^^^^ - please change to debug() as some devices may
> 		enable CONFIG_CLK, but did not yet support (have
> 		implemented) this clock in CCF.

...not for this, I'm going to send a patch changing this string.

Best regards
-- 
Giulio Benetti
Benetti Engineering sas

>> +	}
>> +#endif
>> +
>>   	if (is_lpuart32(dev))
>>   		return _lpuart32_serial_init(dev);
>>   	else
> 
> 
> 
> 
> Best regards,
> 
> Lukasz Majewski
> 
> --
> 
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
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>